Lens-grinding machine.



M. W. BRINKMANN.

LENS GRINDING Mmmm.

APPLICATION YILED NOV. 5, 1907. 969739 Patented Aug. 9,1910.

4 SHEETS-SHEET 1'.

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l `LENS G RINDING MACHINE.

AYPLIOATION FILED Nqv.5,1007.

66,73% v .Emma Aug. 9, 1910.

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` STATES PATENT onirica;

Mouais w. BRINKMANN, or new onx, NQY.

LENs-enmiimo macinata:l

Be it known that I. MORRIS W.l Birmin- MANN, a citizen of the UnitedStates, resid- -ing in the borough of Manhattan of the city of-New York, 1n the State of New York,

have invented certain new and useful Improvements in Lens-Grinding Machinesfot which the followingr is a specification, reference being had to the accompanying drawings, forming a part hereof.

` The object of this invention is to provide suitable mechanism whereby lenses may be.

ground and polished with mathematical acouracy and without flaws, and the invention one ot the holding devices being shown in section.

consists in new and novel features of construction and Icombination of parts hereinafter set forth and claimed.

Referring to the accompanying drawings, Figure 1 represents a plan view of my improved automatic lens grinding machine. Fig. 2 repieseiits'aside elevation thereof,

Fig. 3 represents an end view of the machine'. Fig. 4#tis a detail view showing the mechanism for moving the grinding tool. Fig. 5 represents a vertical section on the line 5-5 of Fig. 2. Fig. 6 is 'a detailV view illustrating a different position of the mechanism shown 1n Fig. 5. F 1gs.7 and 8 are longitudinal and sectional views respectively, showing means for polishing the lens after it has been ground.

The frame of my improved machine comprises a platen l provided with outwardly extending arms or brackets 2 supported by. standards 3. The main driving shaft 4 is journaled in said arms and is rotated by a pulley 6 connected with any suitable source of power. One or more driving pulleys 7 are keyed to the main shaft at suitable distances apart.

The holder for the lens to be ground comprises a. head d secured to aspiiidle 9 haying a pulley 1() keyed thereto which is rotated by a belt 11 from one of the driving pulleys 7. The spindle 9 is rotatably mounted in a bushing 12 supported by the platen. The lens 14, or other article to be ound or polished, is secured to the head Sir wax or any other suitable means. Preferably a plurality of these holders are arranged in line on the platen 'and are used in one machine.

Arranged immediately below the holder or holders is a grinder or grinding tool comprising a concave receptacle or trou h 15 mounted ony trunnions...16 lthat 4are reely movable in bearings 17 provided in the uprights 3 of the frame. Preferably said grinder is adjustable upon the trunnions by means of the set screws ylo. The wearing, abrading or polishing substance if any be used may be placed or secured in thetrough 15 in anysuitable manner.

A swinging or rocking movement is imparted to the grinder through a' slotted arm 19 secured to one of the trunnions 16. Said arm-is actuated by an adjustable crank pin 20 on a gear 21', whichI is rotated through a v train of gears 22; 23 and.24 from-a shaft 25 havincr a pulley 2G thereon which is conspecification bftemrsratent.; Patented Aug. 9, '1910. Applation tiled vNovember 5, 1907. Serial No. 400,880.

nectedzby' suitable iiieansas abclt 27 witha pulley on the main shaft.' Simultaneously with the swinging mv'ement of the grinding tool a reciprocating 4or to and fro movemeiit'thcreof in the hue of its axis .is obtained by mfeaus of an arm 28, which is adjustably secured at one .end to one ot the. trunnions 16 and is provided at its other or. free end with a pin or stud 29.

a gear 3l that meshes with a worin 32 formed u on the shaft 25.

After t e lens 14 has been comprising any suitable polis ing material 33 ina be substituted for the trough or re-- vis flexible and yielding, a rigid arm 36 is .secured by the trunnions so as to insure uniform movemeans of set screws 37 between ment thereof. Preferably the disks 34 are Said pin" engages a slotted arm 30, which is rotated by round a. tooll i movable on the trunnions so that the polish:

ing material may be subjected to considerable tension and thus rctainiits shape when in contact with the lens.

The operation of the machine causes the holders to be rotated at a fixed rate o speed and causes the grinding or polishing tool to rock .or swing and, at the same time, to reciprocateor move to and fro in line with its axis. Both the rate' and the amount of each movement may be readily controlled and adjusted andevery part of the lens be equally subjected to the grinding v4action of the ma; chine. So long as the machine is properly adjusted, it is obvious "that the; grinding must'be performed with mathematical accuT racy with respect to the curvature desired, which vcan be readil determined by the shape of the trough o the grinding tool. It is obvious also that the machine may be used for making various geometrical figures upon the surface of glass or any other material by adjusting and regulating the movements of the arts with relation to each other.

arious changes Within the skill of the mechanic may be made in the mechanism herein set forth Without departing from the spirit of the invention provided the means set forth in the following claims he employed. i

I claim as m invention:

1. In a grin ing and polishing machine, thev combination with a holder, and' means for rotating said holder, of a grinding or polishing tool having an interrupted swinging movement transversely to its sxis and a to and fro movement in the line olf its axis.

2. Ina grinding and polishing machine, the combinationof a holder and a grinding or polishing tool, one of said parts having a rotating movement and the other part having simultaneously a swinging movement and a reciprocating movement in diillerent planes, substantially as described.

3. .In a grinding and polishing machine', the combination with Aa holder, and means for rotating said holder7 of a grinding or 'polishing tool comprising a. receptacle' shaped in section to correspond with the desired curvature of the article to be ground and ai'ranged opposite said holder, means for rocking said receptacle 'and means for reciprocating said receptacle, substantially as described.

4. In a grinding and polishing machine, the combination with a holder comprising a spindle, a head on said spindle, and means for rotating'said spindle and head, of a grinding or-polishing tool c on'iprising a receptacle arranged opposite said holder,

means for rocking said receptacle. means for reciprocatinnr said receptacle, and means for I regulating the rate and extent of said movements, substantially as described.

5. In a grinding and olishingmachine, the combination of a hol ,er and a grinding or polishing tool, voneo said parl-.s having a rotating movement and the other part a swinging movement and a reciprocating -rotating said holder on a stationary axis,

and means for securing the article to be ground to said holder, of a grinding or polishing tool arranged to be in continuous contact with the articleto' be ground and having. simultaneous movement inV planes transolder, means for verse to each other during the' grinding op-' eration7 substantially as described.

7. In a grinding and polishing machine `the combination with aholder for the article to be ground,'and means. for'rotatin said holder on a stationary axis, of a grin ing tool comprisingi triinnions longitudi-v nally4 and rotatably -movable in bearings provided in the frame of the machine, and' means for simultaneously impartinga swinging' movement and a reciprocating movement to said tool.

8. In a grinding yand polishing machine,.

the combination with a holder for the article to be ground, and means for. rotating said holder, of a inding tool comprising tiunnions longitudinally and rotatably]rholv-A able4 in bearings provided in the frame-of.

the machine, and a exible material secii led to said trunnions, means for holding said material to desired shape, and means for vimparting a swinging movement and a re' ciprocating movement to said material.A

9. In a nrindinef and iolishin'or machine,r

D i: D

the combination with a holder for the article to be ground, 'and means for rotating Asaid holder, of a grinding tool comprising trunnions longitudinally and rotatably movable in bearings providedin the frame of the machine and 0rrinding or polishing 'material mounted on said trunnions, a driving gear operatively connected with said'trum' nions for rotating same, and a worm gear` operatively connected with said triinnions ,i

for reciprocating same, substantiallyas del' scribed.

This specification signed and witnessed this 2nd day of November A. I). 1907.

norms W. BRINKMANN.

Signed in therpiesence of- AGNES L. REILLY, Aiiiizosii L. OSi-IEA. 

